120 university of colorado studies 



From a Point on James Peak at an Altitude of 12,500 Feet 

 (Gilpin County) 



Closterium abruptum West. 



Netrium digitus (Ehrenb.) Itzigsh. & Rothe. 



Euastrum bidentatum Nag. 



Cosmarium hammeri Reinsch. 



Tetmemorus laevis (Kiitz.) Ralfs. 



From Corona, Colorado (Grand County), 11,660 Feet 



Closterium braunii Reinsch. 

 C. intermedium Ralfs. 



